Looks alive to me... if White has sente, should it go like this? Where fills at
again?
If it's Black's turn to play, it turns out like this? With White alive once again?
SnotNose: Looks like ko.
(Moved from /Solution).
Dead, I think - Floris?
Dieter: This doesn't prove it is dead, but that it is killable. Is it dead already or unsettled? If so, White can live in ko or live?
unkx80: To put it more directly, when a problem asks for the status of a group, it is effectively asking two questions. 1) Black first to play, what is the best result? 2) White first to play, what is the best result?
SnotNose: Alive. Classic L+1 group living shape.
SnotNose: Dead. Classic L+1 group kill.
SnotNose: doesn't work. Here is one way for Black to kill. There are others.
Rafael: SnotNose says kills. So this is another problem. After the solution to the original problem is settled, this one could be moved to its own page.
unkx80: I think kills "unconditionally". What I am not too sure is, what if
is played at
. I thought it should be a ko.
SnotNose: a and b are miai for the kill.
SnotNose: I think unkx80 is right (that perhaps yields a ko). If Black insists on going for a kill, he will have to ignore
I think. (The
stones steal the eye at the edge after a throw-in so Black need not respond to
right away). Thus, Black can try for the kill with
. Continuation in next diagram.
SnotNose: Unfortuneately, Black cannot chase White all the way to the edge because he is short of liberties. I think the best Black can do is jump out with and fight on the outside. Black is full of cutting points so I think White can break out.
I believe this is the only chance for a kill. Since it fails, White should be at worst alive in ko. Here's one way for ko.
SnotNose: is a good move and almost makes a living shape.
through
are all forced. Any deviation from these lets White live (I think) unconditionally.
SnotNose: Another ko.
SnotNose: Black a, white squeeze at b. No ko this way.